GL_RGBA16F correlates to HAL_PIXEL_FORMAT_RGBA_FP16.
GL_RGB10_A2 that correlates to HAL_PIXEL_FORMAT_RGBA_1010102.

This fills-in key holes between generated ANGLE config formats and the
Android native formats after GL_RGB565 was added to fix the configs
that were missing for some games.

Modified EGLContextCompatibilityTest to exclude GL_RGB10_A2 and
GL_RGBA16F from some of the EGLContextCompatibilityTest cases.
EGLContextCompatibilityTest uses the OSWindow utility, which only
works with UNORM-compatible EGLConfigs that are a proper subset of
GL_RGBA8.  The new configs won't work with the WindowDifferentConfig
and WindowSameConfig test cases.

Bug: angleproject:3155
Change-Id: I693ed24f13ba787ea6d661f42ec65dc3d26f08f6
Reviewed-on: https://chromium-review.googlesource.com/c/1276807Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Ian Elliott <ianelliott@google.com>